81278204 has 12 divisors (see below), whose sum is σ = 162556464. Its totient is φ = 34833504.

The previous prime is 81278189. The next prime is 81278209. The reversal of 81278204 is 40287218.

81278204 is an admirable number.

It is a super-2 number, since 2×81278204² = 13212292890931232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81278209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1451369 + ... + 1451424.

It is an arithmetic number, because the mean of its divisors is an integer number (13546372).

Almost surely, 2^81278204 is an apocalyptic number.

It is an amenable number.

81278204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81278204 is a wasteful number, since it uses less digits than its factorization.

81278204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902804 (or 2902802 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 81278204 is about 9015.4425293493. The cubic root of 81278204 is about 433.1696625809.

The spelling of 81278204 in words is "eighty-one million, two hundred seventy-eight thousand, two hundred four".